Much has been made of Bobby Kennedy's impossible burden following the assassination of his brother. A review of [documents released as recently as a few months ago] by the Globe, fortified by the work of historians and new interviews with former Kennedy aides, paints a picture of a brother responding to the assassination with equal parts crippling grief and growing suspicions. In the five years between his brother's murder and his own assassination in 1968, Bobby Kennedy voiced public support for the findings of the Warren Commission, namely that a pathetic, attention-seeking gunman had alone been responsible for the murder of President Kennedy. Privately, though, Bobby was dismissive of the commission, seeing it ... as a public relations tool. After hearing the news out of Dallas, it's clear that he quickly focused his attention on three areas of suspicion: Cuba, the Mafia, and the CIA. Crucially, Bobby had become his brother's point man in managing all three of those highly fraught portfolios. And by the time the president was gunned down, Bobby understood better than anyone how all three had become hopelessly interwoven, and how much all three bore his own imprint. For while John Kennedy was the one gunned down, Bobby had reason to believe he may have been the ultimate target. Walking the grounds of Hickory Hill just an hour after receiving confirmation of his brother's death, Bobby confided in an aide something truly unsettling. That aide, Edwin Guthman, would later recount it in his book We Band of Brothers." "I thought they would get one of us," Bobby said, adding, "I thought it would be me."